Tactile alarm system for gaining the attention of an individual
AssigneeUnisys Corporation
InventorsElizabeth McRae, Cameron McKenzie
Life of this patent
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Abstract
In an alarm system for gaining the attention of an individual requiring neither sound nor light for its operation, a transmitter unit is activated to send a signal at a predetermined frequency into an induction loop to be received by a receiver unit worn on the person of the individual whose attention it is intended to gain. The transmitter unit sends its signal for at least a predetermined period and the receiver unit responds by activating a mechanical agitator of selectable frequency and amplitude to cause bodily displacement of the receiver unit in a cyclic, periodic manner.
Claims18
A tactile alarm system comprising:
- a transmitter unit, said transmitter unit including transmit means for generating and transmitting a predetermined transmitted signal.
- said transmit means comprising monostable timer means and astable multivibrator means, alarm activator means coupled to said timer means for initiating upon activation a timeout mode in said timer means, said multivibrator means being responsive to said timeout mode for generating said predetermined transmitted signal for the period of operation of said timeout mode.
- a source of electrical power coupled to a first power rail for supplying electrical energy to said transmit means, a fuze connecting said timer means to said first power rail for protecting said timer means from excess currents flowing therethrough as a result of a fault condition, the blowing of said fuze and resultant disconnection of said timer means from said first power rail causing said multivibrator means to initiate the continuous generation of said predetermined transmitted signal, thereby providing an indication of the occurrence of said fault condition.
Dependencies are inferred from the claim text.